This codex contains Saint Ambrose's Hexaemeron. A two-line poem on 1r by Abbot Frowin of Engelberg (1143-1178) dedicates this volume (with its title) to the monastery's patron saint Mary, mother of God. Beneath the dedication, the same hand has written a six-line poem, which likewise makes reference to the contents. A small decorative initial in blue, green, and red ink, as is typical of the library of Frowin, introduces the first book. The remaining books are divided with more simple, red initials. The text and marginal notes, in a dark-brown (and in a few places light brown) ink come from the same hand, a hand with a strikingly clean and balanced appearance. (grd)